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Re: [PSUBS-MAILIST] Double endcaps sub

Alec,
 
Thank you for your input. It's a good idea to use 2 vertical thrusters angled at 45 degrees. The slim pressure hull makes it possible to have  thrusters on both sides without becomming to wide. Being able to move sideways would be very usefull especially in muddy waters. You can keep an eye on the "target" all the time. A bow thruster also stirres up mud right in front of your viewport.
 
A vertical thruster in the bow would indeed change the attitude of the sub. I think in a small sub this can be solved by shifting your weight. Maybe it isn't even a problem at all because when you move forwards a down angle would enlarge the effect of the thruster. So on a fast moving sub in clear water this is still an option.
 
The "sufacing" viewport is also a good idea. Being able to look around while on the surface is a must i think. I was thinking of a small camera that can be rotated and tilted. It would also be an option to have a small conning tower  with some viewports or an acrylic dome. I like simplicity so domes are for me out of the question.              
 
Greatings,
 
Thijs Struijs
----- Original Message -----
From: Alec Smyth
To: personal_submersibles@psubs.org
Sent: Wednesday, April 30, 2003 8:05 PM
Subject: RE: [PSUBS-MAILIST] Double endcaps sub

Cool, it just got pretty! A couple of comments though: If I’m seeing right you have a vertical thruster in the bow, but not matched with one in the stern. This would cause an attitude change, instead of moving you vertically on an even keel.

 

I’m not sure if the side thrusters are movable or fixed. What you might want to consider is a 4-thruster arrangement similar to Phil’s recent subs. Two fore-and-aft thrusters that would give you forward-reverse and rotation. And two midships thrusters angled down 45 degrees. If actuated together they give you vertical movement, but you can also fire one at a time to move sideways. Where you have the vertical thruster now, you might be able to put a “surfacing” viewport so you could see up and ahead.

 

Great job, I feel like building this one someday!

 

Alec

 

 

 

-----Original Message-----
From: Thijs Struijs [mailto:thijs-struijs@planet.nl]
Sent: Wednesday, April 30, 2003 2:11 PM
To: PSUBS
Subject: [PSUBS-MAILIST] Double endcaps sub

 

I have posted some drawings to:

 http://www.prismnet.com/~moki/subfiles.html

 

I have tried to streamline the double endcaps sub. I have added a GRP hull around the pressure hull.  Maybe it looks a little complicated but i think one has to make a mold for only a quater of the GRP hull and use it 3 times. With a little cutting and laminating one could make a hull like that if your are a little inventive (and we all are, are we not?). The keel looks like a box because i don't know yet what it will contain (batteries, VBT, ballast). What i do know is that i want to have a fairing around it. There is a lot of mud in The Netherlands and i don't want to stick in it. The idea is to bolt the fairing to the drop-ballast. So if you get stuck you can drop the ballast together with the fairing and you are free again. 

 

The next thing i will do is to try to make some calculations on the stability.

 

I would like to hear what you think about it.

 

Greatings 

 

Thijs Struijs        

    

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